Universal tapping-machine



W. C. OSTERHOLM. UNIVERSAL TAPPING MACHINE. APPLlATloN FILED 0m26.191s.

Patented Nov. 1, 1921..

' w. c. osTERHoLM. UNIVERSAL TAPPING MACHINE.

APPLICATION FILED DEC. 251 1918- Patented Nov.

n liliiiilmlnlmu Iwan/@0r UNITED STATES WILLIAM C. OSTERI-IOLM, 0FCHICAGO, ILLINOIS.

UNIVERSAL TAPIING--MACI-IINE. v

Application filed December 26, 1918.

To all w 710m t may concern Be it known that I, WILLIAM C. OSTER- HoLM,a citizen of the'United States, residing at Chicago, in the county ofCook, and State of Illinois, have invented certain new and usefulImprovements in Universal Tapping-Machines, of which the following is afull, clear, and exact specification.

This invention relates to tapping machines, and machines of likecharacter.

In order that a tapping machine may successfully perform its function,and operate efliciently and accurately, the toolmust be so mounted thatit can vbe easily and quickly adjusted to the desired position, or, inother words, can be easily and quickly centered. Unless the tap isaccurately centered the screw thread will not be true, and the taplitself may be broken. The object of this invention, therefore, is torender the operation of tapping accurate and eflicient.

A further object is to reduce the tapping expense by eliminatingbreakage, and shortening the time required lfor the tapping operation.

With these and other objects in view, the invention is embodied in anadjustable mounting for the tool, so constructed that the tool can bequickly vand easily adjusted in the desired direction, and can be heldYor locked in the desired position of adjustment.

A furtherv feature ofthe invention is ernbodied in a work holding meansfor securely holding the work against accidental movement so thattheadjustment of the tool need not be changed after the tool hasbeenproperly,` alined with the work. l

In the accompanying drawings the invention has been illustrated inconnection with atapping machine, but it should be understood that myinvention is equally desirable en drilling` and reaming machines, andthat the use onsuch machines is contemplated, and it is my intention tocornprehend all such 4 uses in the appended claims.

I have illustrated oneembcdiment of .my invention in the drawingsaccompanying thisapplication, and in these drawings- Figure 1 shows ayfront elevation of my improved machine;

Fig. 2 is a side elevation of the construction shown in Fig. .1; Y

'Fig 3 is a detail view showing the work holding means; and YSpecification of Letters Patent.

Patented Nov. 1, 1921.

Serial No. 268,344.

Fig. 4i is a sectional view on an enlarged scale showing the hand-wheeland lever for operating the tool.

'Ihe invention is illustrated in connection .with an upright tappingmachine, including the usual pedestal 10, having secured thereto a slidebase 11. A work table support 12 is slidably mounted on the base 11, andhas a dove-tail connection therewith, and a clamping screw r13 securesthe work table support in place on the base 11. A base 14 is alsoslidably mounted on the slide base y11, being connected therewith byy adovevtall connection, and having a clamp 15 for securing the base 14 inplace on the slide base `11. The work table 16 is rotatably mounted onthe work table support 12, and

is provided with a series of apertures located yin the circumference ofaV circle described ywith the center of .rotation of the table as thecenter of the circle.

A locking pin 17 is reciprocably mounted on the work table support 12,and is located in a position to enter any one of the apertures in thework table above described. The kpin 17 is provided atitslower end withja slot, through `which extendsone arm of a` lever18, which is pivotedat` 19 to the work table support, and has its kopposite arm 2O actuatedin a downward direction by means of .a spring .pressed plunger 21 alsocarried by the work rspring 27, which bears at fone end against a collar28 secured to the rod' 26. .and at its opposite end against anyoutwardly proj ect* ing lug 29 carried by the slide base 11. Near itslower endthe rod'26 has secured thereto f. a hanger V30,v havingoutwardly extending projections 31 and 32. The lower' end of therod 26extends into ahanger 33, having corres Ondinev outwardl7V extending)rojections 34 and 35. rrrlhe projections 32 and` r Se and V31 and 35are connected respectively by means of coil springsV 36 and 37. VThehanger 34 is secured to a rod 38, which is pivotally connected at .itslowerend to a foot .treadle 39 pivoted at 40to ,the base of thepedestal. The treadle is provided near `its front endl with a slot 41and a lug 42 projecting over a portion of the slot.

In order to lock the treadle in its lower position, I have provided apivoted latchL 43 having a notch 44 inone edge thereof, and normallypressed forwardly by means of a spring 45. As the treadle is pushed downthe wall of the slot engages the upper beveled edge 46 of the treadle,and forces the latch rearwardly until the treadle reaches its lowermostposition, when the lug Y 42 comes into engagement with the notch 44,

, quick operating mechanism for securing the work to the table and maybe` as quickly released to permit removal of the work after the tappingor drilling operation. Owing to the yielding connection 31-37 work ofvarying sizes may be clamped vto the table 16 without adjustment lof theclamping means. Y

rlhe adjustable mounting for the tool will now be described'. The base14 above described supports vertical standards 47 for thevertically'adjustable support frame 48,

which is vertically slidable on the standards 47 5 and is provided witha split sleeve clamping member 49, which secures the frame in thedesired position of adjustment. The standards 47 Vare connected at theirupper ends by across rail 50, to which are secured idlers 51.

.A counterbalancing means is provided for the supporting frame 48, andconsists of a series ofweights 52 carried by suitable casing 53 securedtothe base 14, and connected by means` of a cable 53 to the supportingframe 48, the cable passing over the idlers 51. yThe tool 54 and toolspindle 55 are mounted for endwise and rotary movement in a saddle oradjustable supporting frame 56. The frame 56 is horizontally adjustableon guideways 57 carried by the supporting frame 48, and is provided withoverlapping `flange members 58 which secure Vthe frame 56 againstdisplacement. 'A clamping screw 59 is carried by the frame 56, andclamps the flanges against the ways in such a manner asV tohold thesaddle or frame 56 in the desired positioniof adjustment.

An operating wheel 60 is secured to the outer end of the spindle 55, andis provided with a slideway formed .by parallel flanges 61, whichproject inwardly or overhang toward the center of the wheel. A VcrankVarm -is insured.

62 is slidably mounted in the slideway, and is provided on its innersurface with a plurality of indentations 63, which are adapted to beengaged by a ball 64 carried by the wheel, and forced outwardly by thespring 65. A handle 66 is mounted on one end of the crank arm 62.

The operation of the machine above described will now be brieiiy setforth. The castings to be tapped or drilled, as the 'case may be, areplaced' on the worktable 16, which is rotatably adjusted as desired, andthe operator then presses downwardly on the foot treadle and bringsthe'work clamping member 24 into contact with the work, this memberbeing held in clamping contact by means of the treadle lockingmember'43. riihe hand screws 49 and. 59 are then loosened, if they arenot already loose, and the operator-grasps the handwheel 60 and guidesthe tap orother tool 54 into the desired position of adjustment. Duringthis guiding of the tool the frame 48 is freely movable vertically onthe standards 47, and the saddle or frame 56 is freely movable in theguideways 57 carried by the standard '48, the counterweights 52assisting the: op-

erator by taking up the weight of the tool, spindle, saddle, andsupporting frame. When the tool has been adjusted to the desiredposition, the hand screws 49-and 59 are tightened, and the topl or othertool is forced into the aperture and the spindle 55, which is rotated bymeans ofthe crank arm 62, the amount of leverage being determined by thepositionof adjustment of the crank arm 62 on the handwheel 60.

From the above description it will be seen that the adjustmentof thetool may be made very quickly and accurately by the use of my improvedmounting, and that the whole operation is exceedingly simple. By meansof the` quick and accurate adjustment, the liability to breakage of thetool is greatly Vdecreased and the accuracy of the operation While Ihave, in the above specification,

described one embodiment which my invention may assume, it should beunderstood that the invention is capable of modification,

standards, counterbalancing means for said supporting frame, a saddlea'djustably mounted on said supporting frame, and a spindle mounted insaidy saddle for rotary and endwise movement.`

2. In combination, a machine frame, supporting standards carriedthereby, a supporting frame vertically adjustableon said and thatmodicationsl may be made without standards, clamping means for securingsaid ysupporting frame in the desired position of adjustment7 a saddlehorizontally adjustable on said supporting frame, clamping means forsecuring said saddle in the desired position of adjustment, and aspindle mounted in said saddle for rotary and end- Wise movement.

3. In a tapping machine, the combination of a main frame, a Work tableadjustably supported thereon, quick operating clamping means forclamping the Work to the table, and adjustable tool-supporting meanscomprising a base adjustably mounted on the main frame and havingvertical standards, a supporting frame adjustably mounted on thestandards, a saddle adjustably carried by the supporting frame, atool-carrying means mounted in said saddle for rotary and endwisemovement and means for operating the tool carrying means.

4l. In a tapping machine, the combination of a main frame, a Work tablesupported thereon, quick operating yieldable clamping means for securingthe Work to the table, a tool spindle adjustable both vertically andhorizontally on the frame and adapted for rotary and endwise movement,and means for operating the spindle.

5. In a machine of the class described, the combination of a main frame,a Work table supported thereon, a clamping arm pvoted to the Work table,a pedal pivoted to the frame, yieldable connections between the arm andpedal, means for holding the pedal in Work clamping position, anadjustable and rotatable tool spindle mounted on the frame in operativerelation to the Work table, and means for operating the spindle.

In testimony whereof I affix my signature.

WILLIAM C. OSTERHOLM.

